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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93070c14255ebf4fb5e3271de0c81cc5d2917bdd84e7d3c7a6b996858d659685' 
  AND token = 'P/PYYtPUaEDcJijHgvdSJk2SGCRR1PHOSynou6h3xKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}